Formats 格式 VCD - VCD is an mpeg1 based format, with a constant bitrate of 1150kbit at a resolution of 352x240 (NTSC). VCDs are generally used for lower quality transfers (CAM/TS/TC/Screener(VHS)/TVrip(analog) in order to make smaller file sizes, and fit as much on a single disc as possible. Both VCDs and SVCDs are timed in minutes, rather than MB, so when looking at an mpeg, it may appear larger than the disc capacity, and in reality u can fit 74min on a CDR74. VCD是一种使用MPEG-1编码的格式. 它的bitrate固定在1150Kbps, 解析度是 352*240 (NTSC). VCD通常被用在低画质的转换上, 以便达到较低的档案大小, 而且通常尽可能制作成能够储存在一个CD上. VCD和SVCD都是使用时间来计算长 度 (而不是使用MB), 因此当将VCD中的影片在MPEG格式的大小可能大於光碟的 容量, 但实际你可以将它储存在一个CDR74中. SVCD - SVCD is an mpeg2 based (same as DVD) which allows variable bit-rates of up to 2500kbits at a resolution of 480x480 (NTSC) which is then decompressed into a 4:3 aspect ratio when played back. Due to the variable bit-rate, the length you can fit on a single CDR is not fixed, but generally between 35-60 Mins are the most common. To get a better SVCD encode using variable bit-rates, it is important to use multiple "passes". this takes a lot longer, but the results are far clearer. SVCD是一个MPEG-2编码 (和DVD相同) 的格式. 它的bitrate在480*480的解析度 时可以达到2500Kbps (在播放时被解压缩成4:3). 由於使用变动的bitrate, 可 以被储存在一个CD-R中的长度并不是固定的, 通常在35~60分钟之间. 要在使用 变动bitrate编码SVCD时, 使用多次pass是十分重要的. 这虽然会消耗相当多的 时间, 但是编码後的画质会清晰许多. XVCD/XSVCD - These are basically VCD/SVCD that don't obey the "rules". They are both capable of much higher resolutions and bit-rates, but it all depends on the player to whether the disc can be played. X(S)VCD are total non-standards, and are usually for home-ripping by people who don't intend to release them. 这些格式简单来说就是不遵守规范的VCD / SVCD. 它们可以使用更高的bitrate 和解析度, 但是不是每个VCD Player都能够播放它们. X(S)VCD根本不是一个规 格. 它们通常被用在私人用途上. DivX / XviD - DivX is a format designed for multimedia platforms. It uses two codecs, one low motion, one high motion. Most older films were encoded in low motion only, and they have problems with high motion too. A method known as SBC (Smart Bit-rate Control) was developed which switches codecs at the encoding stage, making a much better print. The format is Ana orphic and the bit-rate/resolution are inter- changeable. Due to the higher processing power required, and the different codecs for playback, its unlikely we'll see a DVD player capable of play DivX for quite a while, if at all. There have been players in development which are supposedly capable, but nothing has ever arisen. The majority of PROPER DivX rips (not Re-Encs) are taken from DVDs, and generally up to 2hours in good quality is possible per disc. Various codecs exist, most popular being the original Divx3.11a and the new XviD codecs. DivX是一个为了多媒体平台而设计的格式. 它使用两个不同的codec, 分别处理 少量及多量动作的部分. 老旧的DivX影片通常只使用少动作的codec来编码, 因 此在多动作的部分它们通常会有一些问题. 於是发展了SBC (Smart Bit-rate Control) 这个编码方式. 它在编码的阶段就即时选择适合的codec, 因此画质 有了极大的改善. DivX的bitrate和解析度是可以交换的. 由於DivX解码需要强 大的处理能力, 短期内应该不会有播放DivX能力的DVD Player. 虽然有人正在 研发, 但是目前没有任何结果 (按: 可以播DivX的DVD Player出了一两年了吧?) 大多数的PROPER DivX撷取 (未重新编码) 是取自DVD. 一个光碟通常可以储存 2小时拥有良好画质的影片. DivX有许多不同的codec, 最流行的是原始的 Divx3.11a和新的XviD. CVD - CVD is a combination of VCD and SVCD formats, and is generally supported by a majority of DVD players. It supports MPEG2 bit-rates of SVCD, but uses a resolution of 352x480(ntsc) as the horizontal resolution is generally less important. Currently no groups release in CVD. CVD (China Video Disc) 是VCD和SVCD的组合, 它被大多数的DVD Player支援. CVD使用MPEG-2以及和SVCD相同的bitrate, 但是解析度则是352*480 (由於垂直 解析度通常较不重要). 目前没有任何"group"发表CVD格式的影片. DVD-R - Is the recordable DVD solution that seems to be the most popular (out of DVD-RAM, DVD-R and DVD+R). it holds 4.7gb of data per side, and double sided discs are available, so discs can hold nearly 10gb in some circumstances. SVCD mpeg2 images must be converted before they can be burnt to DVD-R and played successfully. DVD>DVDR copies are possible, but sometimes extras/languages have to be removed to stick within the available 4.7gb. DVD-R是可录制的DVD的解决方案, 目前在DVD-R, DVD+R及DVD-RAM中看来是最为 流行的 (按: 目前似乎是DVD+R?). DVD-R单面可储存4.7GB的资料, 同时也有双 面的DVD-R, 使得在某些情况下DVD-R可以储存接近10GB的资料. SVCD中的MPEG-2 影片必须先经过转换才能烧录成DVD Video. DVD到DVD-R的转换是可行的, 但有 时额外的片段及语言必须被移除, 以储存在4.7GB的DVD-R中. MiniDVD - MiniDVD/cDVD is the same format as DVD but on a standard CDR/CDRW. Because of the high resolution/bit-rates, its only possible to fit about 18-21 mins of footage per disc, and the format is only compatible with a few players. MiniDVD使用和DVD相同的格式, 但是使用CD-R / CD-RW作为储存媒体. 由於较 高的解析度及bitrate, MiniDVD只能放入21分钟内的影片. MiniDVD只被某些 DVD Player支援. Misc Info 综合资讯 Regional Coding - This was designed to stop people buying American DVDs and watching them earlier in other countries, or for older films where world distribution is handled by different companies. A lot of players can either be hacked with a chip, or via a remote to disable this. 区码的目的是防止美国的DVD被购买并提早销售到其他国家, 也为了解决某些早 期影片的全球销售权被其他公司掌握的问题. 许多DVD Player都可以藉由一个晶 片甚至是遥控器来取消区码 (Region-Free / 全区) RCE - RCE (Regional Coding Enhancement) was designed to overcome "Multiregion" players, but it had a lot of faults and was overcome. Very few titles are RCE encoded now, and it was very unpopular. 加强型区码被设计来打败全区DVD Player, 但是因为本身有许多错误而失败了. 极少数的影片使用加强型区码. Macrovision - Macrovision is the copy protection employed on most commercial DVDs. Its a system that will display lines and darken the images of copies that are made by sending the VHS signals it can't understand. Certain DVD players (for example the Dansai 852 from Tescos) have a secret menu where you can disable the macrovision, or a "video stabaliser" costs about 30UKP from Maplin (www.maplin.co.uk). Macrovision是一个被广泛使用在商业DVD上的防拷方式. 在进行未经授权的数 位复制时, DVD内的软体会启动Macrovision, 借由输出错误的VHS讯号, 来扭曲 , 黑化输出的影像 (前面那句我觉得原文怪怪的, 我就自己写了). 某些DVD Player (像是Tescos的Dansai 852) 有个秘密选单可以关闭Macrovision, 也可 以利用一个30英镑的"影像稳定器"来关闭Macrovision. NTSC/PAL - NTSC and PAL are the two main standards used across the world. NTSC has a higher frame rate than pal (29fps compared to 25fps) but PAL has an increased resolution, and gives off a generally sharper picture. Playing NTSC discs on PAL systems seems a lot easier than vice-versa, which is good news for the Brits. An RGB enabled scart lead will play an NTSC picture in full colour on most modern tv sets, but to record this to a VHS tape, you will need to convert it to PAL50 (not PAL60 as the majority of DVD players do.) This is either achieved by an expensive converter box (in the regions of ￡200+), an onboard converter (such as the Dansai 852 / certain Daewoos / Samsung 709 ) or using a World Standards VCR which can record in any format. NTSC和PAL是两个主要的影像格式. NTSC拥有较高的frame rate (29.97FPS, PAL 为25FPS), 但是PAL拥有较高的解析度, 通常也有较瑞利的影像. 在PAL系统上 播放NTSC的光碟比反过来容易多了 (对英国人来说是个好消息).一个有RGB的 "scart lead"可以在PAL的电视上播放彩色的NTSC光碟. 但是若要将NTSC光碟录 制在VHS录影带上, 就需要将它转换为PAL50格式 (并非DVD Player使用的PAL60) . 这可以利用一个昂贵 (200英镑以上) 的转接盒, 一个DVD Player内建的转换 器或是一个世界标准的录影机. ====================================================================== 有些原文明显的错误我就直接改了, 像是NTSC写成NTCS, NTSC的29FPS (应为29.97FPS) 等等. 有些实在不知道怎麽翻的像"scart lead"就保留原文. 有些原文里面out-dated的东西 (像是DVD Player播放DivX) , 用"按"来标示. 後面和影像格式不相关的就先不翻了...念微方去...>"< --

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